A reinforced toilet seat for fat/chunky people. Commonly found in trailer parks.
Damn, Aunt Bessie I didn't know you had a dumper-bumper!
by the dumper-bumper bandit February 25, 2009
Someone who enjoys giving anal sex. Can be a straight male, who likes pounding a hot chic's ass, or a gay male.
Good thing I'm a dumper bumper because my girlfriend is a real ass slut.
by Dumper Bumper February 20, 2011